How to use Auth.js for client-side authentication in Next.js

Auth.js, formerly known as NextAuth.js, is a secure and flexible authentication library that integrates with multiple OAuth services and supports passwordless sign-in methods such as magic links. It can function with or without a database, offering compatibility with popular databases like MySQL and MongoDB. The library is particularly useful for securing Next.js applications, simplifying the authentication process with its client-side API and React Hooks. Auth.js v5 introduces improvements such as a unified API call for session management and streamlined configuration for GitHub and email providers. The setup involves configuring environment variables, setting up OAuth providers, and optionally integrating a database for magic link authentication. Auth.js also allows customization through various callbacks and middleware, providing developers with control over user sessions, JWTs, and protected routes. The library aims to enhance security, scalability, and ease of use in modern web applications by simplifying the integration of authentication protocols.

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